1NCN

the receptor-binding domain of human B7-2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.214 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structure of the Receptor-Binding Domain of Human B7-2: Insights into Organization and Signaling

Zhang, X.Schwartz, J.D.Almo, S.C.Nathenson, S.G.

(2003) Proc.Natl.Acad.Sci.USA 100: 2586-2591

  • DOI: 10.1073/pnas.252771499

  • PubMed Abstract: 
  • B7-1 and B7-2 are homologous costimulatory ligands expressed on the surfaces of antigen-presenting cells. Their interactions with CD28/CTLA-4 receptors expressed on T cell surfaces are crucial for the proper regulation of T cell activity. B7-1 and B7 ...

    B7-1 and B7-2 are homologous costimulatory ligands expressed on the surfaces of antigen-presenting cells. Their interactions with CD28/CTLA-4 receptors expressed on T cell surfaces are crucial for the proper regulation of T cell activity. B7-1 and B7-2 display distinct roles in immune regulation, although they are usually considered to have redundant functions. Here, we report the crystal structure of the receptor-binding (Ig V-type) domain of human B7-2 at 2.7-A resolution. Structures of unliganded and liganded B7-1 and B7-2 suggest a physical-chemical basis for the observed functional similarities and differences between these two costimulatory ligands. Of particular note, whereas the majority of the residues mediating B7-1 dimerization are hydrophobic, the B7-2 dimer observed in the B7-2/CTLA-4 complex displays a very hydrophilic dimer interface. These differences provide a mechanism for preventing the formation of B7-1/B7-2 heterodimers. The divergence at the putative dimer interface is also consistent with the lower tendency of B7-2 to dimerize, as shown by the monomeric state of unliganded B7-2 both in solution and crystalline form, and may result in detailed differences in signaling mechanisms associated with B7-1 and B7-2.


    Related Citations: 
    • Expression, Refolding, Purification, Molecular Characterization, Crystallization, and Preliminary X-ray Analysis of the Receptor Binding Domain of Human B7-2
      Zhang, X.,Schwartz, J.-C.D.,Almo, S.C.,Nathenson, S.G.
      (2002) Protein Expr.Purif. 25: 105


    Organizational Affiliation

    Department of Cell Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
T lymphocyte activation antigen CD86
A, B
110Homo sapiensMutation(s): 0 
Gene Names: CD86 (CD28LG2)
Find proteins for P42081 (Homo sapiens)
Go to Gene View: CD86
Go to UniProtKB:  P42081
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.214 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 56.690α = 90.00
b = 63.010β = 90.00
c = 58.610γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
SOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-03-11
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance